Finding the Fourth Proportional to 2,820.72, 4,230.72 and 971.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.72 : 4,230.72 = 971.76 : x
2. Step 2: Convert to fraction form
   2,820.72/4,230.72 = 971.76/x
3. Step 3: Cross multiply
   2,820.72x = 4,230.72 × 971.76
4. Step 4: Simplify right side
   2,820.72x = 4,111,244.47
5. Step 5: Solve for x
   x = 4,111,244.47/2,820.72
6. Step 6: Final answer
   x = 1,457.52